How exactly does a Water-Activated MRE Flameless Instant Heater Pad work? What chemical causes the reaction?

Answer 1

basically it's magnesium powder (and some iron oxide) that's being oxidzed when you add water, this is an exothermic reaction so it releases heat, it's similar to thermite actually but thermite uses Aluminum, not Magnesium

Answer 2

Mre Heater Uses

Answer 3

- An FRH safely and quickly heats food without the need for electricity or flame. The FRH MRE heater is ideal for soldiers in the field, campers, hunters, or anyone interested in emergency preparedness.


* Raises temperature of 8 oz. food pouch
100 degrees F.
* Uses no flame or electricity
* Activates with water
* Biodegradable
* Easy to carry
* Lightweight Packaging
* 5 year shelf-life
* Easy disposal
* A hot meal in just
12 minutes

- FRH MRE heaters are approximately the shape and size of a playing card, weigh less than one ounce, and are easy to store. There are 648 MRE heaters per master carton.
- TRUETECH TM MRE Heaters have a 5 year shelf-life.
- Spent pads are easily disposed of, with no toxic materials. The FRHs are made from powdered food grade iron, magnesium, and salt, all biodegradable materials.
- Each FRH MRE heater is individually packaged in a durable, leak-proof polybag which serves as the heating container for the MRE.